Material Properties and Testing

Envel panel systems are produced using ultra-high performance concrete (UHPC). Research and development of UHPC began more than 20 years ago, and the result of this research was a technological breakthrough in cementitious materials. The matrix is such that it has extremely low porosity and permeability, thereby attributing to its superior durability, ductility and strength. (Compared to conventional concrete, it has 6 to 8 times more compressive strength and up to 10 times more flexural strength.)

The benefits of UHPC are many: excellent resistance to abrasion, impact, chemicals, freeze-thaw, carbonation and chloride ion penetration. It is also extremely moldable, which makes it ideal material for a vast range of architectural and structural precast elements that are thin and lightweight with enhanced surface finishes.

Over the years, UHPC’s performance characteristics have been further tested, validated and certified by numerous independent academic and industry organizations, and our experts at Envel are committed to staying informed and up-to-date with regard to all industry discoveries and recommendations.

Additionally, Envel panels have undergone extensive independent tests to establish and validate their superior performance and durability characteristics. This document outlines a number of tests conducted by CTL & ATI-Intertek:

Envel Testing and Standards 

Standard

Description

Performance

ASTM C39

Standard Test Method for Compressive Strength of Cylindrical Concrete Specimens

18,000 psi

ASTM C496

Standard Test Method for Compressive Strength of Cylindrical Concrete Specimens

2,100 psi

ASTM C293

Standard Test Method for Flexural Strength of Concrete (3 point loading)

1,700 psi

ASTM C642

Standard Test Method for Density, Absorption, and Voids in Hardened Concrete

4.60%

ASTM C418

Standard Test Method for Abrasion Resistance of Concrete by Sandblasting

Abrasion Coeff. Loss .21 cm3/cm2

ASTM C531

Standard Test Method for Linear Shrinkage and Coeff. Of Thermal Expansion

5.71E-06

ASTM C666

Standard Test Method for Resistance of Concrete to Rapid Freezing and Thawing (301 cycles)

Length Change% /.020 Mass Change%
.04 Relative Dynamic Modulus 96%

ASTM C1185

Section 11 Water Tightness 1/2” Thick Panel

No Water Droplets Present

ASTM E84

Standard Test Method for Surface Burning
Characteristics of Building Materials

Flame Spread 0 Smoke Dev. 0

ASTM E488

Freeze Thaw Conditioned Samples / Tensile & Shear Evaluation. 1/2” Thick Panel, 13mm Keil Anchor

Tensile 390# / Shear 800#

ASTM E330

Structural Wall Performance Test

Greater than 90 psf

ASTM 501.6

Seismic Performance Test

Pass

ASTM E136

Standard Method for Behavior of Materials in a Vertical Tube Furnace

Pass

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